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Message-ID: <403B97D3.6040202@appliedsec.com>
Date: Tue, 24 Feb 2004 13:28:35 -0500
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To: Hans Lellelid <hans@velum.net>, internals@lists.php.net
References: <403053EC.6090501@velum.net>
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Subject: Re: segfault in shutdown sequence
From: hans@appliedsec.com (Hans Lellelid)

Hi -  I know that this segfault report is quite vague.  Can anyone tell 
me by looking at the stacktrace where I could start looking for the 
problem?    I have not tested this on latest snapshot (the stacktrace 
below is w/ PHP5b4), but am told the problem persists.  Seems clearly to 
be in shutdown sequence but beyond that I'm not sure -- Reflection_API, 
XML (expat) ... ?  Not using destructors...

Thanks-
Hans

Hans Lellelid wrote:
> I'm getting a segfault at the end of (successful) script execution. 
> Appears to be an issue in the shutdown sequence; I'm unsure how to 
> report this bug, since providing duplicating code is not possible.
> 
> The segfault is happening at the end of a Phing (http://phing.info) 
> build process, which involves many (over a hundred, I'm sure) classes, 
> uses reflection api heavily, XML (expat), etc.
> 
> Here's a bugtrace from the core file.  I don't know if this is any help 
> at all.  I was hoping to find some 'execute' lines so I could track down 
> the issue in my code.  This seems to be just part of the shutdown 
> sequence, though. If anyone has some suggestions for things I could look 
> for, please let me know.
> 
> Thanks,
> Hans
> 
> #0  0x0818e625 in zend_mm_remove_from_free_list (heap=0x81f7a80, 
> mm_block=0xbed43144)
>     at /home/work/php-5.0.0b4/Zend/zend_mm.c:163
> #1  0x0818e158 in zend_mm_free (heap=0x81f7a80, p=0xbed434b0)
>     at /home/work/php-5.0.0b4/Zend/zend_mm.c:356
> #2  0x0816bf79 in _efree (ptr=0x3) at 
> /home/work/php-5.0.0b4/Zend/zend_alloc.c:283
> #3  0x0818bc50 in zend_objects_free_object_storage (object=0xbed44fec)
>     at /home/work/php-5.0.0b4/Zend/zend_objects.c:78
> #4  0x0818e94e in reflection_free_objects_storage (object=0xbed44fec)
>     at /home/work/php-5.0.0b4/Zend/zend_reflection_api.c:191
> #5  0x0818da3c in zend_objects_store_del_ref (zobject=0x3)
>     at /home/work/php-5.0.0b4/Zend/zend_objects_API.c:140
> #6  0x0817c1d1 in _zval_dtor (zvalue=0xbed443e4)
>     at /home/work/php-5.0.0b4/Zend/zend_variables.c:61
> #7  0x08174f79 in _zval_ptr_dtor (zval_ptr=0xbed48798)
>     at /home/work/php-5.0.0b4/Zend/zend_execute_API.c:359
> #8  0x08182da0 in zend_hash_destroy (ht=0xbedae214)
>     at /home/work/php-5.0.0b4/Zend/zend_hash.c:513
> #9  0x0817c1fd in _zval_dtor (zvalue=0xbedafc14)
>     at /home/work/php-5.0.0b4/Zend/zend_variables.c:52
> #10 0x08174f79 in _zval_ptr_dtor (zval_ptr=0xbed46430)
>     at /home/work/php-5.0.0b4/Zend/zend_execute_API.c:359
> #11 0x08182da0 in zend_hash_destroy (ht=0xbed44324)
>     at /home/work/php-5.0.0b4/Zend/zend_hash.c:513
> #12 0x0818bc47 in zend_objects_free_object_storage (object=0xbedac1cc)
>     at /home/work/php-5.0.0b4/Zend/zend_objects.c:77
> #13 0x0818d878 in zend_objects_store_free_object_storage 
> (objects=0x81f7f70)
>     at /home/work/php-5.0.0b4/Zend/zend_objects_API.c:71
> #14 0x08174d90 in shutdown_executor ()
>     at /home/work/php-5.0.0b4/Zend/zend_execute_API.c:273
> #15 0x0817d4ec in zend_deactivate () at 
> /home/work/php-5.0.0b4/Zend/zend.c:813
> #16 0x0814cd9b in php_request_shutdown (dummy=0x0)
>     at /home/work/php-5.0.0b4/main/main.c:1243
> #17 0x081a13bf in main (argc=9, argv=0xbff651c4)
>     at /home/work/php-5.0.0b4/sapi/cli/php_cli.c:1044